Patent US2812898A successfully refreshed from Google Patents.
US2812898A
Expired / Lapsed
US
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Reverse action rotors for use in a jet propulsion system
Assignee: Individual
•
Filing: 1954-02-25
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Granted: 1957-11-12
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Expires: 1974-02-25
Abstract
No abstract record available.
Inventors
- 👤 Ernest H Buell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:22
CPC Classifications
F; F02; F02C; F02C3/00; F02C3/04; F02C3/06; F02C3/067
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2439273A
Cited
US2505660A
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US2134334A
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GB586555A
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US2472878A
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US2702985A
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US2563270A
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US2625794A
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US2625790A
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US2625013A
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US2639579A
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US2672013A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-11 | 1961-05-13 | 1961-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-11 | 1965-05-13 | 1965-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-11 | 1969-05-13 | 1969-11-12 | $7700.00 | Window Closed / Lapsed |